72531895656 has 64 divisors (see below), whose sum is σ = 197839065600. Its totient is φ = 21976606400.

The previous prime is 72531895651. The next prime is 72531895687. The reversal of 72531895656 is 65659813527.

It is a junction number, because it is equal to n+sod(n) for n = 72531895596 and 72531895605.

It is not an unprimeable number, because it can be changed into a prime (72531895651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3299341 + ... + 3321251.

It is an arithmetic number, because the mean of its divisors is an integer number (3091235400).

Almost surely, 2^72531895656 is an apocalyptic number.

It is an amenable number.

72531895656 is an abundant number, since it is smaller than the sum of its proper divisors (125307169944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72531895656 is a wasteful number, since it uses less digits than its factorization.

72531895656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34470 (or 34466 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 57.

The spelling of 72531895656 in words is "seventy-two billion, five hundred thirty-one million, eight hundred ninety-five thousand, six hundred fifty-six".